Adam Clarke on Judges 16:4

He loved a woman in the valley of Sorek - Some think Samson took this woman for his wife; others, that he had her as a concubine. It appears she was a Philistine; and however strong his love was for her, she seems to have had none for him. He always matched improperly, and he was cursed in all his matches. Where the valley or brook of Sorek was, is not easy to be ascertained. Eusebius and Jerome say it lay southward of Eleutheropolis; but where was Eleutheropolis? Ancient writers take all their measurements from this city; but as it is nowhere mentioned in the Scriptures, it is impossible to fix its situation for we know not its ancient name.